Verified Solution • 2025–26 Session moderate

QPages 365-366: Q25: HC Verma: Concepts of Physics - Volume 2 Photoelectric Effect and Wave-Particle Duality Pages 365-366: Q25 Solution: A photographic film is coated with a silver bromide layer. When …

A photographic film is coated with a silver bromide layer. When light falls on this film, silver bromide molecules dissociate and the film records the light there. A minimum of 0.6 eV is needed to dissociate a silver bromide molecule. Find the maximum wavelength of light that can be recorded by the film. Use h=6.63×10−34 J-s=4.14×10−15 eV-sh = 6.63 \times 10^{-34} \text{ J-s} = 4.14 \times 10^{-15} \text{ eV-s}, c=3×108 m/sc = 3 \times 10^8 \text{ m/s} and me=9.1×10−31 kgm_e = 9.1 \times 10^{-31} \text{ kg})

Step-by-Step Verified Solution

**Answer:** λmax=2.07×10−6\lambda_{max} = 2.07 \times 10^{-6} m. **Step-by-Step Explanation:** ϕ=0.6\phi = 0.6 eV. λmax=12400.6=2067\lambda_{max} = \frac{1240}{0.6} = 2067 nm =2.07×10−6= 2.07 \times 10^{-6} m.

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